UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
General Certificate of Education Ordinary Level
*0922348103*
5054/02
PHYSICS
Paper 2 Theory
May/June 2009
1 hour 45 minutes
Candidates answer on the Question Paper.
Additional Materials:
Answer Booklet/Paper
READ THESE INSTRUCTIONS FIRST
Write your Centre number, candidate number and name on all the work you hand in.
Write in dark blue or black pen.
You may use a soft pencil for any diagrams, graphs or rough working.
Do not use staples, paper clips, highlighters, glue or correction fluid.
DO NOT WRITE IN ANY BARCODES.
Section A
Answer all questions.
Write your answers in the spaces provided on the Question Paper.
Section B
Answer any two questions.
Write your answers on the lined pages provided and, if necessary, continue on the separate answer paper
provided.
At the end of the examination, fasten all your work securely together.
The number of marks is given in brackets [ ] at the end of each question or part question.
For Examiner’s Use
Section A
Q9
Q10
Q11
Total
This document consists of 16 printed pages.
SPA (SJF5063/CG) T74829/5
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2
Section A
For
Examiner’s
Use
Answer all the questions in this section.
1
A piece of paper falls from 4.0 m above the ground.
Fig. 1.1 shows how the height h above the ground varies with the time t.
4.0
h/m
3.0
2.0
1.0
0
0
0.5
1.0
2.0
1.5
t/s
Fig. 1.1
(a) State what happens to the speed of the paper as it falls.
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(b) Calculate the speed of the paper at time t = 1.5 s.
speed = ………………………………… [2]
(c) As the paper falls, energy changes from one form to another.
State the main energy change between t = 1.0 s and t = 2.0 s.
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2
Fig. 2.1 shows a metal pan containing water on a cooker. The hotplate heats the water.
For
Examiner’s
Use
handle
water
X
metal pan
cooker
hotplate
Fig. 2.1
(a) (i)
State the method of heat transfer through the metal pan.
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(ii)
Describe how the molecules transfer heat through the metal pan.
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(b) (i)
(ii)
On Fig. 2.1, draw an arrow to show the direction of movement of the water at point X.
[1]
Explain why the water moves in this direction.
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3
Fig. 3.1 shows apparatus to measure the specific latent heat of fusion of water.
In this question, you may ignore heat transfer to the ice from the room.
electric heater
crushed ice at 0°C
funnel
glass beaker
Fig. 3.1
The heater is switched on and water drips into the beaker at a constant rate.
In 2.0 minutes, 31 g of water drips into the beaker. The power of the heater is 85 W.
(a) Calculate the amount of electrical energy supplied to the heater in 2.0 minutes.
energy = ………………………………… [2]
(b) Use your answer to (a) to calculate the specific latent heat of fusion of water.
specific latent heat = ………………………………… [2]
(c) In another experiment using the same heater, ice colder than 0 °C is used.
State why less water drips into the beaker in 2.0 minutes.
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For
Examiner’s
Use
5
4
Fig. 4.1 shows the arrangement of molecules in a solid and in a liquid.
solid
For
Examiner’s
Use
liquid
Fig. 4.1
(a) State one difference between the two arrangements.
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(b) By writing about the forces between molecules and the motion of molecules, explain
why
(i)
the molecules of a solid and of a liquid have different arrangements,
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(ii)
the evaporation of a liquid cools the liquid,
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(iii)
the rate of evaporation is greater when a liquid is hotter.
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5
Fig. 5.1 shows a man looking at his reflection in a rectangular plane mirror.
For
Examiner’s
Use
plane mirror
h
X
Fig. 5.1
The vertical side of the mirror has length h.
(a) (i)
(ii)
On Fig. 5.1, draw a ray of light from point X that is reflected by the mirror to the
man’s eye.
[1]
On Fig. 5.1, mark the angle of incidence of your ray at the mirror.
Label this angle i.
(iii)
[1]
Define the angle of incidence.
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(b) On Fig. 5.1, draw a ray of light from the top of the man’s hat that is reflected by the
mirror to his eye.
Use your rays to determine the smallest value of h that allows the man to see all of the
image in the mirror, from the top of his hat to his toes.
On the diagram, 1 cm represents 0.5 m.
h = ………………………………… [2]
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6
Fig. 6.1 shows how ultrasound is used to produce an image of the heart.
heart
For
Examiner’s
Use
ultrasound
ultrasound
transmitter and detector
Fig. 6.1
(a) Define ultrasound.
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(b) The ultrasound has a wavelength of 1.2 × 10–3 m. The speed of the ultrasound in the
human body is 1500 m / s.
Calculate the frequency of the ultrasound.
frequency = ………………………………… [2]
(c) Ultrasound is a longitudinal wave.
Describe how particles in the body move as the ultrasound passes.
You may draw a diagram if you wish.
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(d) There are small bubbles of gas in the body.
Explain why these bubbles expand and contract as the ultrasound passes.
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7
Fig. 7.1 shows two pieces of soft iron in the magnetic field of a strong permanent magnet.
soft iron
N pole
of magnet
S pole
of magnet
Fig. 7.1
The pieces of soft iron become magnetised.
(a) On Fig. 7.1, mark the magnetic poles produced at each end of both pieces of soft iron.
[1]
(b) Fig. 7.2 shows a reed switch.
soft iron
glass
Fig. 7.2
The reed switch is placed between the poles of the strong permanent magnet.
State and explain what happens.
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Examiner’s
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9
(c) Fig. 7.3 shows two separate electrical circuits.
For
Examiner’s
Use
warning lamp
coil
thermistor
Fig. 7.3
One circuit consists of a reed switch, a cell and a warning lamp. The other circuit consists
of a thermistor, another cell, and a coil wound round the reed switch. The thermistor is
at the same temperature as the air around it.
(i)
State what happens to the thermistor when the temperature of the air rises.
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(ii)
Explain why the warning lamp lights up when the air temperature rises.
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8
238
The symbol 92 U represents a nucleus of uranium with nucleon number (mass number) 238
and proton number (atomic number) 92.
(a) State the meaning of nucleon number.
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(b) A nucleus of uranium-238 decays to form a nucleus of thorium by the emission of an
alpha-particle.
State
(i)
the proton number of an alpha-particle,
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(ii)
the nucleon number of an alpha-particle,
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(iii)
the proton number of thorium,
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(iv)
the nucleon number of the thorium isotope formed.
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Examiner’s
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11
Section B
Answer two questions from this section.
Use the lined pages provided and, if necessary,
continue on the separate sheets available from the Supervisor.
9
(a) A lamp is marked 24 V, 100 W. Describe an experiment to check that the electrical power
supplied to the lamp is 100 W when the potential difference (p.d.) across it is 24 V.
In your account you should
•
include a circuit diagram,
•
state the readings that are taken,
•
show how the result is calculated from the readings.
[4]
(b) Two lamps are connected in parallel to a 240 V mains supply, as shown in Fig. 9.1.
240 V
R
lamp A, 190
Q
lamp B, 380
P
Fig. 9.1
Lamp A has a resistance of 190 Ω and lamp B has a resistance of 380 Ω.
(i)
Calculate the current at points P, Q and R.
[3]
(ii)
Calculate the total resistance of the circuit.
[2]
(c) Fig. 9.2 shows the same lamps connected in series to the mains supply.
240 V
S
lamp A
190
lamp B
380
Fig. 9.2
(i)
Calculate the current at point S.
[2]
(ii)
Calculate the p.d. across lamp A.
[1]
(d) In a house, all lamps are connected in parallel to the mains supply, not in series.
State and explain two reasons for this.
In your explanation you may refer to the results of your calculations in (b) and (c).
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10 Fig. 10.1 shows the horizontal forces as a cyclist travels forwards.
air resistance
driving force
Fig. 10.1
The cyclist produces the driving force that acts on the back wheel.
In this question, you may ignore any frictional force acting on the front wheel.
(a) The bicycle accelerates until a constant speed is reached.
(i)
Describe how the size of the air resistance changes during this time.
[2]
(ii)
Compare the sizes of the two horizontal forces when the bicycle is accelerating.
[1]
(b) The total mass of the bicycle and the cyclist is 75 kg. At one instant, the speed of the bicycle
is 4.0 m / s, the driving force is 30 N and the air resistance is 20 N.
Calculate
(i)
the total kinetic energy of the bicycle and the cyclist,
[3]
(ii)
the acceleration of the bicycle and the cyclist.
[2]
(c) As the bicycle moves, energy is transmitted from the pedals to the back wheel.
Fig. 10.2 shows what happens to the energy input to the pedals.
400 J of
energy
input to
pedals
20 J of
energy
lost
energy
supplied
to back
wheel
Fig. 10.2
(i)
As energy is transmitted to the back wheel, some is lost. Explain how this happens.
(ii)
Calculate the efficiency of the bicycle in transmitting energy from the pedals to the back
wheel.
[2]
(d) Some bicycles are made from low density materials. Explain why this is an advantage.
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[3]
13
11 An a.c. generator produces alternating current.
(a) (i)
(ii)
Draw a labelled diagram of a simple a.c. generator.
[3]
Explain how the current is generated.
[2]
(b) The output of the generator is connected to the terminals of a cathode-ray oscilloscope.
Fig. 11.1 shows the trace produced on the screen of the oscilloscope.
1 division
trace
Fig. 11.1
(i)
Each vertical division on the scale in Fig. 11.1 represents 2 volts.
Describe how you would check that one vertical division represents 2 volts.
(ii)
[4]
The trace in Fig. 11.1 is too small and is at the bottom of the screen.
Adjustments are made to the oscilloscope controls to produce the trace in Fig. 11.2.
Fig. 11.2
(iii)
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State and explain the adjustments made to the oscilloscope controls.
[3]
Explain how the beam of electrons is produced inside the cathode-ray oscilloscope.
[3]
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Examiner’s
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